The Phosphorus Cycle (College Board AP® Environmental Science): Flashcards
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- FrontThe Phosphorus Cycle
Define phosphorus cycle.
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Cards in this collection (14)
Define phosphorus cycle.
The phosphorus cycle is the movement of phosphorus atoms and phosphorus-containing molecules through the environment.
True or False?
Organisms need phosphorus only in trace amounts.
False.
Phosphorus is a limiting macronutrient required in large amounts for DNA, RNA and ATP.
What are examples of phosphorus sources?
Phosphorus sources include the weathering of rocks, the decomposition of organic matter and agricultural runoff.
Unlike other nutrient cycles, the phosphorus cycle does not include a phase.
Unlike other nutrient cycles, the phosphorus cycle does not include a gaseous phase.
What are examples of phosphorus sinks?
Phosphorus sinks include sediments in water bodies and soils.
In what form is phosphorus mainly stored in rocks and sediments?
Phosphorus is mainly stored in rocks and sediments as phosphate minerals.
How does weathering release phosphorus into the soil?
Rain and natural erosion break down phosphate-containing rocks, releasing phosphate ions into the soil.
How do animals obtain phosphorus?
Animals obtain phosphorus by eating plants or other animals.
release phosphorus back into the soil or water as they break down dead organisms.
Decomposers release phosphorus back into the soil or water as they break down dead organisms.
True or False?
Phosphorus that settles into sediments in water bodies returns to the cycle within a few years.
False.
Phosphorus in sediments can remain there for millions of years.
Define geological uplift.
Geological uplift is when geological processes lift phosphorus-containing sediments to form new land, making the phosphorus available again.
How does the lack of an atmospheric component affect phosphorus in ecosystems?
Because phosphorus does not move through the air, its movement between ocean and land is limited, making it naturally scarce in many ecosystems.
Which nutrient is often the limiting nutrient for plant growth in undisturbed ecosystems?
In undisturbed ecosystems, phosphorus is often the limiting nutrient for plant growth.
Why is phosphorus fertilizer added to agricultural fields?
Phosphorus fertilizer is added because natural soil phosphorus levels are too low to support intensive farming.
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